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Capillary condensation of water vapor within a particulate bed
Author(s) -
Shukla P. N.,
Wilkinson B. W.
Publication year - 1986
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690320318
Subject(s) - kelvin equation , capillary action , compressibility , thermodynamics , surface tension , hydrostatic equilibrium , capillary condensation , curvature , chemistry , condensation , equation of state , laplace pressure , laplace's equation , evaporation , capillary pressure , mechanics , laplace transform , porous medium , porosity , physics , differential equation , mathematics , geometry , mathematical analysis , organic chemistry , adsorption , quantum mechanics
For situations in which capillary condensation of water occurs (e.g., within porous media), the thermodynamics can usually be studied by means of the Laplace and Young equations and a compressibility equation. We show here that the compressibility equation for the liquid does not reflect the criteria of equal gas and liquid phase potential changes at equilibrium, for departures from a specified reference state. Carman (1953) concluded that the capillary condensate can exist in a state of tension for large vapor‐liquid pressure differentials and may exhibit physical properties that differ substantially from normal values. The familiar Kelvin equation is used to calculate the capillary curvature and is derived from the general Laplace and Young relationship. Melrose (1966) has obtained this relationship by matching the coefficients of the internal free energy and hydrostatic balances of the system shown in Figure 1.